As it relates to SolrJ, HashMap vs LinkedHashMap for facet queries will be completely inconsequential.
The only potential burden here lies with the server side - is there some reason solr might not want to return them in order in the future? I really can't think of a realistic reason why not.

Yonik Seeley
added a comment - 12/Mar/10 20:38 I'll go ahead and make this change soon if there are no objections.
As it relates to SolrJ, HashMap vs LinkedHashMap for facet queries will be completely inconsequential.
The only potential burden here lies with the server side - is there some reason solr might not want to return them in order in the future? I really can't think of a realistic reason why not.

Yonik Seeley
added a comment - 14/Mar/10 05:55 Committed. I almost didn't add a CHANGES entry this is so trivial... if others agree we could just remove and lessen the amount of noise people need to read through.

Hoss Man
added a comment - 28/May/10 04:19
Correcting Fix Version based on CHANGES.txt, see this thread for more details...
http://mail-archives.apache.org/mod_mbox/lucene-dev/201005.mbox/%3Calpine.DEB.1.10.1005251052040.24672@radix.cryptio.net%3E